Use array of chars instead of String builder in DocumentFormatterUtil#cpf where length is predicted

[snuyanzin]

No description provided.

[what-the-diff]

PR Summary

• Improvement in Document Formatting
  The changes in DocumentFormatterUtil.java now allow better and more accurate formatting of CPF numbers. This is done by the inclusion of periods and dashes at the appropriate places in the number.

• Enhanced CPF Number Generation
  The logic in IdNumberGeneratorPtBrUtil.java has been modified. It now generates valid CPF numbers as character arrays, which it then converts to strings. This ensures the generation of correctly formatted CPF numbers.

• CPF Format Validation Additions
  A new function has been added in CPFTest.java. This function uses regular expressions (a way to match patterns in data) to check that the CPF number is in the correct format. This addition increases the robustness of the format validation process.

[codecov-commenter]

Codecov Report

Merging #977 (9ad4dc6) into main (8d79729) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##               main     #977      +/-   ##
============================================
- Coverage     92.33%   92.24%   -0.09%     
+ Complexity     2760     2757       -3     
============================================
  Files           289      289              
  Lines          5518     5522       +4     
  Branches        601      601              
============================================
- Hits           5095     5094       -1     
- Misses          270      274       +4     
- Partials        153      154       +1     

Files	Coverage Δ
...tafaker/idnumbers/pt/br/DocumentFormatterUtil.java	100.00% <100.00%> (ø)
...ker/idnumbers/pt/br/IdNumberGeneratorPtBrUtil.java	92.85% <100.00%> (ø)

... and 1 file with indirect coverage changes

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